EU VAT Validation

Example

{
  "valid": true,
  "vat_number": "SE556703748501",
  "company_name": "Spotify AB",
  "country_code": "SE",
  "request_date": "2026-04-03+02:00",
  "company_address": "REGERINGSGATAN 19 \n111 53 STOCKHOLM"
}

Inputs

Output fields

How reliably each field appears in a successful answer.

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Needs an API key. max_price_cents caps what this call may cost.
curl -X POST https://api.strale.io/v1/do \
  -H "Authorization: Bearer $STRALE_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "vat-validate",
    "inputs": {
      "vat_number": "DE811128135"
    },
    "max_price_cents": 2
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "vat-validate",
    "inputs": {
      "vat_number": "DE811128135"
    },
    "max_price_cents": 2
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "vat-validate",
  inputs: {
    "vat_number": "DE811128135"
  },
  max_price_cents: 2,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="vat-validate",
    inputs={
        "vat_number": "DE811128135",
    },
    max_price_cents=2,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/vat-validate?vat_number=DE811128135'

Limitations

• VIES can be unavailable or limit requests

  VIES can be unavailable or throttle requests under unpublished per-member-state limits. Transient faults are retried, and cached results, including older fallback results, can be returned during outages.

  What to do instead: Lookups within 48 hours can use cached results; if VIES is unavailable and no cached result exists, retry later.

• Registration changes and cached results can lag

  Results can be cached for 48 hours, and national registry changes can take a further 24 hours to appear in VIES. Check the national tax authority directly for same-day registration or deregistration confirmation.

  What to do instead: For real-time same-day verification, contact the national tax authority directly.

• Swiss UID public-tier VAT lookup is boolean only

  Swiss UID validation returns valid or invalid only, without a company name or address. This tool does not perform the separate enrichment lookup, whose public service is limited to 20 requests per minute.

  What to do instead: For Swiss company name + address, call the swiss-company-data capability.

• UK VAT checks are unavailable without HMRC access

  GB VAT numbers return a credentials-pending error when the HMRC connection is not configured.

  What to do instead: Use vat-format-validate for GB format checks; it does not confirm VAT registration.